Pipe fixes, vent standardization, AI announce fixes.

code/ATMOSPHERICS/utils.dm

@@ -0,0 +1,29 @@
+/**
+ * Atmospherics-related utilities
+ */
+
+// Shapes
+#define PIPE_BINARY   0
+#define PIPE_STRAIGHT 1 // Like binary, but rotates differently.
+#define PIPE_BENT     2
+#define PIPE_TRINARY  3
+#define PIPE_UNARY    4
+#define PIPE_4W       5
+
+// For straight pipes
+/proc/rotate_pipe_straight(var/newdir)
+	switch(newdir)
+		if(SOUTH) // 2->1
+			return NORTH
+		if(WEST) // 8->4
+			return EAST
+		// New - N3X
+		if(NORTHWEST)
+			return NORTH
+		if(NORTHEAST)
+			return EAST
+		if(SOUTHWEST)
+			return NORTH
+		if(SOUTHEAST)
+			return EAST
+	return newdir